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What is a Password Generator?

A secure password generator creates random passwords using a cryptographically secure pseudorandom number generator (CSPRNG). The strength of a password is measured in bits of entropy — each additional character exponentially increases the number of possible combinations an attacker must try. A 12-character password using all character types (uppercase, lowercase, numbers, symbols — ~95 options per character) has 95^12 ≈ 10^23 possible combinations. At 1 billion guesses per second, cracking it would take longer than the age of the universe. Using a unique, randomly generated password for every account prevents credential stuffing attacks (where leaked passwords from one site are tried on others).

How to Use the Password Generator Tool

1. Adjust the length slider — 16 characters or more is recommended for high-security accounts.

2. Select character types to include: uppercase letters, lowercase letters, numbers, and symbols.

3. Enable 'Exclude Ambiguous Characters' to avoid easily confused characters like 0/O and l/I/1 for passwords you'll type manually.

4. The password updates automatically as you change settings.

5. Click 'Generate Password' to create a new random password with the same settings.

6. Click 'Copy' to copy the password to your clipboard.

This password generator uses the Web Crypto API (window.crypto.getRandomValues) for cryptographically secure randomness — all generation happens in your browser and passwords are never transmitted. The entropy meter shows the bit strength of the generated password. Use a password manager to store generated passwords.

Frequently Asked Questions

How long should my password be? A minimum of 12 characters is widely recommended; 16+ is better for important accounts. Length is more important than complexity — a random 20-character lowercase password is stronger than a 10-character mixed-case password.

What is password entropy? Entropy measures the unpredictability of a password in bits. It's calculated as log2(charset_size^length). Each additional bit of entropy doubles the number of guesses needed. 60+ bits is good; 80+ bits is excellent for most purposes.

Should I use a password manager? Yes. A password manager (like Bitwarden, 1Password, or KeePass) generates and stores unique passwords for every site so you only need to remember one master password. This is the most practical way to use strong unique passwords everywhere.

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